Visual nozzle

Abstract

The invention discloses a visual nozzle that can be applied to simulating a real nozzle of a direct injection engine. The visual nozzle comprises a nozzle body, an adapting head and transparent glasses at an extended segment, wherein the nozzle body forms an internal flow path of the nozzle by means of clamping two pieces of transparent glasses and a precise gasket by using two clamp bodies, the gasket is capable of guaranteeing air tightness; the top of the nozzle body is connected with the adapting head, while the bottom of the nozzle body is connected with the transparent glasses at the extended segment, so as to form an external flow path of the nozzle. According to the visual nozzle disclosed by the invention, by means of simultaneously observing internal flow characteristics (such as cavitation, and generation, growth as well as rupture progresses of bubbles), and external spray characteristics (such as rupture, atomization and evaporation) of the nozzle, the internal and external characteristics of the nozzle are correlated, so that fracture and atomization progresses of liquid jet flows can be mastered comprehensively; the two-dimensional visual nozzle is relatively symmetrical in structure and convenient to process, is capable of realizing continuous test at high-temperature and high-pressure conditions; meanwhile, the internal and external flow paths of the nozzle are changeable in the shape, the structure as well as the size, and internal and external fluid characteristics of a nozzle hole under different conditions can be acquired, therefore, the visual nozzle is universal.

Description

technical field [0001] The invention belongs to the technical field of liquid atomization, and relates to a visualized transparent nozzle, in particular to a visualized nozzle used for simulating a real direct-injection engine nozzle for an internal combustion engine. Background technique [0002] Liquid atomization technology is used in many fields, such as spraying, pharmaceuticals, powder metallurgy, pesticide spraying, especially in various engines (liquid rocket engines, ramjet engines, internal combustion engines, gas turbines, aero engines, etc.), the spray characteristics are the most important One of the characteristics that is critical to engine performance. For example, for high-pressure direct injection engines, spray characteristics have a great influence on engine combustion and emissions performance. Therefore, the test of the spray characteristics of the engine fuel injector is of great significance to the design and development of the engine combustion syst...

AI Technical Summary

Problems solved by technology

[0009] After searching the existing technical literature, it is found that there are no related patents at home and abroad, but after consulting an article of the Society of Automotive Engineers (SAE) with the retrieval number 2005-01-3684, the article introduces a real-sized single-hole nozzle , the exterior is composed of visible acrylic glass, and the interior is realized by the lift of the needle valve. Although the acrylic glass is easy to process, it cannot withstand high fuel temperature and pressure, so it cannot simulate the reality of high-temperature fuel. At the same time, although the design realizes the visualization of the inside and outside of the nozzle, but because it is in the three-dimensional environment of the curved surface, it can only give a basic qualitative description of the phenomenon inside and outside the hole, and it cannot be accurately quantitatively tested.

At the same time, the nozzle can only simulate a certain size of direct injection nozzle, which is not universal

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